<template>
  <div class="article-page" v-if="articleData">
    <van-nav-bar left-arrow @click-left="$router.back()" fixed>
      <template #title>
        <div class="nav-author" v-show="isShowTitle">
          <van-image
            round
            width="7vw"
            height="7vw"
            :src="articleData.aut_photo"
          />
          <span class="name">{{ articleData.aut_name }}</span>
          <span class="line">|</span>
          <span class="follow" @click="followAuthor" :class="{un:articleData.is_followed}">{{articleData.is_followed?'取消关注':"关注"}}</span>
        </div>
      </template>
      <template #right>
        <van-icon name="ellipsis" size="5.4vw"></van-icon>
      </template>
    </van-nav-bar>
    <!-- 文章主体 -->

    <div class="article-wrapper" @scroll="onScroll" ref="article">
      <!-- 头部：标题 时间 作者 -->
      <div class="header" ref="header">
        <h3 class="title">{{ articleData.title }}</h3>
        <div class="time">
          <span>{{ articleData.pubdate }}</span>
          <span>|</span>
          <span>{{ articleData.read_count }} 阅读</span>
          <span>|</span>
          <span>{{ articleData.comm_count }} 评论</span>
        </div>
        <div class="author van-hairline--bottom">
          <van-image
            round
            width="10vw"
            height="10vw"
            :src="articleData.aut_photo"
          />
          <span class="name">{{ articleData.aut_name }}</span>
          <van-button v-if="articleData.is_followed" @click="followAuthor()" round size="small" >取消关注</van-button>
          <van-button v-else @click="followAuthor()" round size="small" color="#FC6627">+ 关注</van-button>
        </div>
      </div>
      <!-- 内容：文章内容 -->
      <van-skeleton title avatar :row="10" v-if="isLoading"/>
      <div class="main" ref="main" v-else>
        <div class="html" v-highlight v-html="articleData.content"></div>
        <div class="space"></div>
      </div>
      <!-- 评论：评论组件 -->
      <article-comment @click-comment="srollToComment" :article="articleData"></article-comment>
    </div>
  </div>
</template>
<script>
import { getArticleDetail, followAuthor } from '@/api/article'
import articleComment from './components/article-comment.vue'
export default {
  components: {
    articleComment
  },
  data () {
    return {
      toComment: false,
      articleData: null,
      isShowTitle: false,
      isLoading: true
    }
  },
  created () {
    // 初始化
    this.getArticleDetail()
  },
  methods: {
    srollToComment () {
      const scrollTop = this.$refs.header.scrollHeight + this.$refs.main.scrollHeight

      this.toComment = !this.toComment
      if (this.toComment) {
        this.$refs.article.scrollTop = scrollTop
      } else {
        this.$refs.article.scrollTop = 0
      }
    },
    async followAuthor () {
      const [err] = await followAuthor(this.articleData.aut_id, !this.articleData.is_followed)
      if (err) return this.$toast.fail(err)
      // console.log(data)

      this.articleData.is_followed = !this.articleData.is_followed
    },
    onScroll () {
      // 1.获取滚动
      // this.$refs.article.scrollHeight - this.$refs.main.offsetHeight
      this.isShowTitle = this.$refs.article.scrollTop > this.$refs.header.offsetHeight
    },
    async getArticleDetail () {
      this.isLoading = true
      const [err, data] = await getArticleDetail(this.$route.query.id)
      if (err) return this.$toast.fail(err)
      // console.log(data)
      // 赋值数据
      this.articleData = data.data
      this.isLoading = false
    }
  }
}
</script>
<style lang="less" scoped>
.article-wrapper {
  height: 100%;
  overflow-y: auto;
  padding: 44px 0 50px;
  // 头部
  .header {
    padding: 0 16px;
    .title {
      font-size: 20px;
      font-weight: normal;
      padding: 10px 0;
      margin: 0;
    }
    .time {
      font-size: 12px;
      color: #999;
      span:nth-child(2n) {
        margin: 0 5px;
        color: #ccc;
        position: relative;
        top: -1px;
      }
    }
    .author {
      display: flex;
      align-items: center;
      padding: 10px 0;
      .name {
        flex: 1;
        padding-left: 10px;
        font-size: 16px;
      }
    }
  }
  // 内容
  .main {
    .space {
      height: 16px;
      background: @geek-gray-color;
    }
    .html {
      word-break: break-all;
      width: 100%;
      overflow: hidden;
      padding: 20px 16px;
      /deep/ img {
        max-width: 100%;
        background: #f9f9f9;
      }
      /deep/ pre {
        white-space: pre-wrap;
        code {
          white-space: pre;
        }
      }
    }
  }
}

/deep/ .van-nav-bar__title {
  max-width: 270px;
  width: 270px;
}
.nav-author {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  > span {
    font-size: 14px;
    padding-left: 5px;
  }
  .line {
    color: #ccc;
    position: relative;
    top: -1px;
  }
  .follow {
    color: @geek-color;
    // 不加&  .follow .un   后代选择器
    // 加上&  .follow.un    交集选择器
    &.un {
      color: #999;
    }
  }
}
</style>
